【摘要】 自苦参 (SophoraflavescensAit.)块根中分离得到一种 32kD的凝集素蛋白 (SFL) ,其对兔血及人的 4种血型都具有很强的凝集活性 ,对棉花枯萎病菌 (FusariumvasinfectumAtk .)、小麦赤霉病菌 (Gibberellasaubinetii (Mont.)Sacc .)和水稻稻瘟病菌 (PiriculariaoryzaeCav .)的生长有明显抑制作用。依此凝集素蛋白N端部分氨基酸序列合成引物 ,通过 5′、3′_RACE技术 ,从苦参块根总RNA中克隆到了编码这一凝集素蛋白的全长cDNA序列 (已注册GenBank ,AF2 851 2 1 )。根据全长cDNA序列推导这一cDNA序列编码一个 2 84个氨基酸的前体蛋白 ,而分离得到的凝集素蛋白为一个 2 54个氨基酸残基的成熟蛋白 ,在其第 1 82位点含一个N糖基化位点N_L_S。更多还原

【Abstract】 A lectin protein(SFL) with molecular weight about 32 kD which markedly agglutinated rabbit and human red blood cells was purified from the roots of Sophora flavescens Ait. This protein, and apparently inhibited the growth of Fusarium vasinfectum Atk., Gibberella saubinetii (Mont.) Sacc., and Piricularia oryzae Cav. A set of degenerate PCR primer was synthesized according to the N_terminal sequence of the purified protein. The full_length cDNA coding the lectin was cloned by RT_PCR and 5′_RACE and sequenced (GenBank AF285121). The deduced amino acid sequence indicates that a preprotein with 284 amino acid residues is firstly translated and then processed to a mature protein with 254 amino acids. A N_Glycosylation site is the Asn 182 residue.更多还原